Common Twilio errors
What you'll achieve
Fix the most common telephony problems.
Step by step
| Symptom | Likely cause | What to do |
|---|---|---|
| Phone lines shows Locked | The Twilio account is missing. | Add the credentials. |
| The number verification never finishes | The call wasn't answered or the code wasn't entered. | Repeat Verify number with the phone at hand. |
| Test connection fails on Caller ID verified or Imported to Retell | The verification or the import didn't complete. | Verify the number again; check that the Retell credential is chosen under Voice. |
| Twilio shows Low balance or Out of credit | Balance below USD 20, or enough for less than 3 days. | Top up from Top up in Provider status. |
| Calls with reason Invalid number or Dialing blocked | The contact's number is not valid or can't be dialed. | Fix the contact's phone in Clients. |
| Calls with reason Provider call rate limit | A limit on the provider account was reached. | Check the account limits and retry the failed ones. |
| Calls Marked as spam | The contact's carrier flagged the number. | Check the caller ID verification. |
How to verify it worked
The line shows Line verified, Twilio shows Funded and the campaign's calls go out (Call coverage → Called).